Mechanical characterization of secondary-hardening martensitic steel using nanoindentation

T. Ohmura, T. Hara, Kaneaki Tsuzaki, H. Nakatsu, Y. Tamura

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Mechanical characterizations using nanoindentation technique were performed for the martensitic steel used as practical dies steel containing carbide-former elements of Cr, Mo, W, and V, which are responsible for secondary hardening by tempering. The nanohardness Hn corresponding to the matrix strength shows obvious secondary hardening, and the hardening-peak temperature coincides with that of the macroscale hardness Hv. By comparing the temper-softening behavior of the high-purity Fe-C binary martensite, the ratio of the nanohardness Hn of the dies steel to that of the Fe-C binary steel is approximately a factor of two, whereas the same ratio of the macroscopic hardness Hv is three at the secondary-hardening peak. These results suggest that the secondary hardening of the dies steel during tempering is attributed not only to the nanoscale strengthening factors such as precipitation hardening by the alloy carbides, but also to some other factors in larger scale. One of the strengthening factors in larger scale is a decomposition of 9% retained austenite to much harder phases, such as martensite and/or ferrite-cementite constituent.

Original languageEnglish
Pages (from-to)79-84
Number of pages6
JournalJournal of Materials Research
Volume19
Issue number1
Publication statusPublished - Jan 1 2004
Externally publishedYes

Fingerprint

Martensitic steel
Nanoindentation
nanoindentation
hardening
Steel
Hardening
steels
Nanohardness
tempering
Tempering
martensite
Martensite
carbides
Carbides
hardness
Hardness
cementite
precipitation hardening
Age hardening
Strengthening (metal)

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Mechanical characterization of secondary-hardening martensitic steel using nanoindentation. / Ohmura, T.; Hara, T.; Tsuzaki, Kaneaki; Nakatsu, H.; Tamura, Y.

In: Journal of Materials Research, Vol. 19, No. 1, 01.01.2004, p. 79-84.

Research output: Contribution to journalArticle

Ohmura, T. ; Hara, T. ; Tsuzaki, Kaneaki ; Nakatsu, H. ; Tamura, Y. / Mechanical characterization of secondary-hardening martensitic steel using nanoindentation. In: Journal of Materials Research. 2004 ; Vol. 19, No. 1. pp. 79-84.
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